How to Stop Mould on Walls

Key Takeaways

  • Ventilation is Crucial: Regularly open windows to allow fresh air circulation, especially after activities that increase humidity, such as cooking or showering.
  • Use Dehumidifiers: In areas prone to high humidity, like bathrooms and kitchens, consider using a dehumidifier to maintain optimal moisture levels and prevent mould growth.
  • Regular Cleaning: Clean walls and surfaces regularly to remove any early signs of mould. Use appropriate cleaning solutions and ensure the area is well-ventilated during the process.
  • Monitor Humidity Levels: Keep indoor humidity below 60% to reduce the risk of mould formation. Using a hygrometer can help monitor and maintain desired humidity levels.
  • Address Leaks Promptly: Any leaks in plumbing or roofing should be repaired immediately to prevent water accumulation, which can lead to mould growth.

Remove Moulds on Walls in Five Steps

Apply Vinegar Solution: Mix equal parts of white vinegar and water, spray on mould, let sit for an hour, scrub, and wipe clean.
Use Baking Soda Paste: Make a paste with baking soda and water, apply to mould, let dry, scrub off, and rinse.
Spray Tea Tree Oil Spray: Combine 1 teaspoon of tea tree oil with 1 cup of water, spray on mould, leave overnight, and wipe clean.
Use Hydrogen Peroxide Solution: Mix equal parts water and 3% hydrogen peroxide, apply to mould, wait 10 minutes, scrub, and rinse.
Apply Lemon Juice: Apply lemon juice directly on mould, let sit for 5 minutes, then wipe clean.


Most households face mould on their walls. It appears awful and is probably not good for your health. This article will help you eliminate mould and avoid its occurrence. Mould on walls is unsightly and can pose health risks, especially for those with allergies or respiratory issues.

What is Mould?

Mould is a type of fungus that grows in damp areas. You may see it in your walls’ black, green, or white patches. Mould spreads through tiny spores in the air.

Why Mould Grows on Walls

Mould grows on walls primarily due to excess moisture and poor ventilation. When moisture accumulates on surfaces, it creates an ideal environment for mould spores to thrive. Mould thrives on moisture and most often appears in rooms with high humidity. Bathrooms and kitchens are two of the most common places where mould spots appear. Poor ventilation can be a worsening factor.

Health Risks of Mould

Mould can be a health hazard. Some people have allergic reactions or asthma attacks, while others get headaches or feel tired. Mould needs to be cared for right away.

How to Remove Mould on the Wall?

mould on the wall

Following are a few homemade ways to remove moulds on the walls:

1. Vinegar solution

  • Mix equal quantities of white vinegar with water in a spray bottle
  • Spray the mouldy area with this and let it stay that way for an hour
  • Scrub it with a brush and wipe clean

2. Baking soda paste

  • Mix baking soda with water until you have a smooth paste.
  • Apply to the mould and let dry.
  • Scrub off with a brush and then rinse.

3. Tea tree oil spray

  • One teaspoon of tea tree oil to 1 cup of water in a spray bottle.
  • Spray on mould and leave overnight.
  • Wipe clean the next day.

4. Hydrogen peroxide solution

  • Mix equal amounts of water with 3% hydrogen peroxide solution.
  • Dip the cloth in this solution and apply to the mouldy area.
  • Let sit for 10 minutes, then scrub and rinse.

5. Lemon juice

  • Apply onto mould directly.
  • Let it sit for 5 minutes, then wipe clean.
  • The acid in the lemon helps kill the mould.

6. Borax solution

  • Mix 1 cup of borax with 4 litres of water.
  • Apply to mould areas and scrub.
  • Do not rinse off, as borax prevents mould growth afterwards.

Remember to wear gloves and masks when handling mould. For larger areas, you may need expert advice or a professional cleaner.

  1.  

How to Prevent Mould Growth

Fix Leaks

Find any leaks in your walls, roof, and pipes, and take urgent measures to repair them. The slightest leak can develop into a huge mould problem since moisture accumulates, creating the right conditions for moulds to grow and thrive.

Look for areas around windows, near/under sinks, and attics where water may enter. If you find damp areas, fix the leak yourself or call a professional. The faster you are concerned about the leak, the less chance there will be for mould to spread and damage to the structure of your home and the air quality.

Improve Ventilation

Open the windows. In bathrooms and kitchens, use exhaust fans to blow damp air outside.

Use a dehumidifier in damp rooms. Try to keep indoor humidity below 60%. You can buy a small device called a hygrometer to measure humidity.

Insulate Cold Surfaces

  • Cold walls can cause condensation. This invites mould. Add insulation to reduce this problem.
  • Clean and Dry Regularly
  • Wipe down damp surfaces after showers or cooking. Don’t let water sit on windowsills or other surfaces.

Use Mould-Resistant Products

Mould-resistant paint and wallpaper can be used when decorating. These specialized products contain anti-fungal agents that help prevent mould from developing on the surface. Before applying, ensure the walls are thoroughly cleaned and any existing mould is removed.

Distance between Furniture and Walls

A little gap should be allowed between furniture and walls. It creates space for airflow and prevents damp spots.

Heat up the Home

Your home should be kept warm at all times, even when you are away. This allows condensation to be absorbed before it forms on cold walls.

Flooding

Home flooding should be attended to urgently to ensure everything is dried up within a day or two to prevent mould formation.

Natural Mould Deterrents

Certain plants help eliminate mould. Keep peace lilies or Boston ferns in damp rooms. They absorb moisture from the air.

Tea tree oil is a natural mould killer. Mix several drops with water in a spray bottle and use it to clean mouldy areas.

When to Call in the Pros

Sometimes, mould problems are out of your hands. Here’s when to call in a professional:

  • The mouldy area is larger than 1 square meter.
  • You have health issues that might be related to mould.
  • You have cleaned mould again and again, and it keeps on coming back
  • You think it is also inside your walls

Frequently Asked Questions

 

What causes mould to grow on walls?

Mould thrives in damp, humid environments. High indoor humidity, poor ventilation, and water leaks are common contributors to mould growth on walls.

How can I remove existing mould from walls?

Clean the affected area with a mixture of water and detergent or a commercial mould remover. Scrub the surface gently and ensure the area dries completely afterward.

Can I prevent mould without using chemicals?

Yes, improving ventilation, using dehumidifiers, and regular cleaning can help prevent mould without the need for chemical treatments.

Is it safe to paint over mould?

Painting over mould is not recommended. It’s essential to remove the mould first to prevent it from continuing to grow under the paint, which can lead to further damage.

When should I consult a professional?

If mould covers a large area (more than 1 square meter), or if you have health concerns, it’s advisable to consult a professional mould remediation specialist.

 

 

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Sam Fitzgerald – CSRT Damp Surveyor

Author – CSRT Damp Surveyor
Sam is a highly qualified and seasoned damp surveyor with over ten years of specialised experience. With a strong academic foundation in building surveying and numerous professional certifications, Sam has established himself as an authority in the field of damp diagnosis and remediation.

At Damp Surveyors Ltd, Sam applies his extensive knowledge to help homeowners across the UK address and solve their damp issues effectively. His approach combines cutting-edge techniques with a commitment to honest, client-focused service, ensuring that every survey and recommendation is tailored to the specific needs of the property.

As a thought leader, Sam’s insights into damp prevention and treatment have been featured in industry publications, underscoring his role as a trusted expert dedicated to maintaining the integrity and comfort of your home.

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